Noble Gases

Uses & Applications Helium filling balloons inert gas shield cooling medium for nuclear reactors

Helium

filling balloons

inert gas shield

cooling medium for nuclear reactors

Uses & Applications Neon neon advertising signs gas lasers economical cryogenic refrigerant

Neon

neon advertising signs

gas lasers

economical cryogenic refrigerant

Uses & Applications Argon in electric light bulbs & fluorescent lamps inert gas shield

Argon

in electric light bulbs & fluorescent lamps

inert gas shield

Uses & Applications Krypton in fluorescent lamps in flash lamps

Krypton

in fluorescent lamps

in flash lamps

Uses & Applications Xenon electronic flash guns electron tubes

Xenon

electronic flash guns

electron tubes

Uses & Applications Radon natural radioactive source self-luminous paint

Radon

natural radioactive source

self-luminous paint

The Periodic Table: Halogens

What are they ?

Characteristics metals or non-metals? reactive or non-reactive? number of valence electrons? exist as diatomic molecules extreme right of the Periodic Table 7

metals or non-metals?

reactive or non-reactive?

number of valence electrons?

exist as diatomic molecules

extreme right of the

Periodic Table

Fluorine gas (r.t.p.) pale yellow in colour melting point : -220 ÌŠ C boiling point : -188 ÌŠ C

gas (r.t.p.)

pale yellow in colour

melting point : -220 ÌŠ C

boiling point : -188 ÌŠ C

Chlorine gas (r.t.p.) yellowish green in colour melting point : -101 ÌŠ C boiling point : -35 ÌŠ C

gas (r.t.p.)

yellowish green in colour

melting point : -101 ÌŠ C

boiling point : -35 ÌŠ C

Bromine liquid (r.t.p.) reddish-brown in colour melting point : -7 ÌŠ C boiling point : +59 ÌŠ C

liquid (r.t.p.)

reddish-brown in

colour

melting point : -7 ÌŠ C

boiling point : +59 ÌŠ C

Iodine solid (r.t.p.) shiny black in colour melting point : +114 ÌŠ C boiling point : +184 ÌŠ C

solid (r.t.p.)

shiny black in colour

melting point : +114 ÌŠ C

boiling point : +184 ÌŠ C

Putting them into a TABLE...

Table Form Do you notice any trends?? Solid +184 +114 Shiny Black Iodine Liquid +59 -7 Red-Brown Bromine Gas -35 -101 Yellowish Green Chlorine Gas -188 -220 Pale Yellow Fluorine State (r.t.p.) Boiling Point ( ÌŠ C) Melting Point ( ÌŠ C) Colour Name

Trends Fluorine Chlorine Bromine Iodine Colour darkens ; M.P. and B.P. increases Reactivity increases

Reactivity How do we know which is more reactive? Halogen Displacement Reactions

How do we know which is more reactive?